did disc11

discussions/disc11.sql

@@ -0,0 +1,32 @@
+CREATE TABLE pizzas AS
+  SELECT "Artichoke" AS name, 12 AS open, 15 AS close UNION
+  SELECT "La Val's"         , 11        , 22          UNION
+  SELECT "Sliver"           , 11        , 20          UNION
+  SELECT "Cheeseboard"      , 16        , 23          UNION
+  SELECT "Emilia's"         , 13        , 18;
+
+CREATE TABLE meals AS
+  SELECT "breakfast" AS meal, 11 AS time UNION
+  SELECT "lunch"            , 13         UNION
+  SELECT "dinner"           , 19         UNION
+  SELECT "snack"            , 22;
+
+-- Q1: Open Early
+select name from pizzas where open < 13 order by name;
+
+-- Q2: Study Session
+create table study as select name as name, max(14 - open, 0) as duration 
+  from pizzas order by duration DESC;
+
+-- Q3: Late Night Snack
+create table snack as select pizzas.name || " closes at " || pizzas.close as status
+  from pizzas, meals where meals.meal = "snack" and pizzas.close >= meals.time;
+
+-- Q4: Double Pizza
+-- Two meals at the same place
+CREATE TABLE double AS
+  SELECT a.meal AS first, b.meal AS second, name
+  FROM meals AS a, meals AS b, pizzas
+  WHERE b.time - a.time > 6
+  AND pizzas.open <= a.time
+  AND pizzas.close >= b.time;